# Chemistry

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If 25 grams of copper(II) sulfate pentahydrate were heated until all water was removed, how much residue would remain?- Could someone help me understand this question? I don't understand it at all. Thanks

• Chemistry -

CuSO4.5H2O ==> CuSO4 + 5H2O
The question is asking how much CuSO4 is left if all of the H2O is driven off.
The easy way to do this is calculate % water in CuSO4.5H2O.

• Chemistry -

Since there is 5H2O is about 36% of CUSO4 + 5H2O , would there be about 16 g of residue left over? Thanks

• Chemistry -

0.64 x 25 = about 16.

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